JZ
About
Justin Zeefe is Founding Partner at Green Flag Ventures; a dual-US/Ukraine-based venture capital firm investing in early-stage, innovative Ukrainian technology startups. Prior to co-founding Green Flag, Justin co-founded Nisos: the Managed Intelligence Company, which delivers smart defense and effective response against advanced threat actors, disinformation, and abuse of digital platforms for the Fortune 1000. Before co-founding Nisos, Justin served for a decade in the US Government, pursuing & countering sophisticated digital adversaries.
Position in the VCSift Database
- • 473 investors hold the Founding Partner role in VCSift. Justin Zeefe is one of them.
- • 1,751 investors are based in California, United States.
Data sourced from 410,343 investor profiles. Updated July 2026.
Investment Focus
- Location
- California, US
Contact Information
linkedin.com/in/••••••••
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